InChI=1S/C17H17NO7S/c1-24-16-11(20)7-8-5-6-18-15-12(8)14(16)9-3-2-4-10(19)13(9)17(15)25-26(21,22)23/h2-4,7,15,17-20H,5-6H2,1H3,(H,21,22,23)